<template>
  <el-dialog
    width="500px"
    title="员工导入"
    :visible="showExcelDialog"
    @close="$emit('update:showExcelDialog', false)"
  >
    <el-row type="flex" justify="center">
      <div class="upload-excel" @dragover.prevent @drop="drop">
        <input
          ref="excel-upload-input"
          class="excel-upload-input"
          type="file"
          accept=".xlsx, .xls"
          @change="uploadChange"
        >
        <div class="drop">
          <i class="el-icon-upload" />
          <el-button type="text" @click="load">下载导入模板</el-button>
          <span>将文件拖到此处或
            <el-button type="text" @click="chuan">点击上传</el-button>
          </span>
        </div>
      </div>
    </el-row>
    <el-row type="flex" justify="end">
      <!-- update:props属性名，值 直接修改 .sync修饰符的属性值 -->
      <el-button size="mini" type="primary" @click="$emit('update:showExcelDialog', false)">取消</el-button>
    </el-row>
  </el-dialog>

</template>
<script>
// 导入api
import { getExportTemplate, uploadExcel } from '@/api/employee'
// 导入处理从后端获取的数据文件进行下载依赖引入
import FileSaver from 'file-saver'
export default {
  // 接收父参
  props: {
    showExcelDialog: {
      type: Boolean,
      default: false
    }
  },
  methods: {

    // 点击下载导入模板
    async load() {
      const result = await getExportTemplate()
      FileSaver.saveAs(result, '员工导入模板.xlsx')
    },
    // 点击上传模拟点击了input file
    chuan() {
      // 模拟点击了input标签file的那个
      this.$refs['excel-upload-input'].click()
    },
    // 文件改变进行上传数据
    async uploadChange(event) {
      // 当file文件改变时,触发事件
      // 上传的是这个数据 event.target.files
      // console.log(1)
      console.log(event.target.files)
      // 调用上传接口
      // uploadExcel() // 参数  form-data 需要文件file
      const files = event.target.files // input的文件列表
      // if (files.length > 0) {
      // 大于0 说明有文件要上传
      const data = new FormData()
      // file: file类型
      data.append('file', files[0]) // 将文件参数加入到formData中
      await uploadExcel(data)
      // 成功
      this.$refs['excel-upload-input'].value = ''
      this.$emit('getDepartment') // 通知父组件 刷新员工数据
      this.$message.success('增加成功')
      this.$emit('update:showExcelDialog', false) // 关闭弹层
    },
    //  拖拽功能
    async drop(e) {
      e.preventDefault()
      // console.log(e)
      const result = e.dataTransfer.files[0]
      const data = new FormData()
      data.append('file', result)
      await uploadExcel(data)
      this.$emit('getDepartment') // 通知父组件 刷新员工数据
      this.$message.success('增加成功')
      this.$emit('update:showExcelDialog', false) // 关闭弹层
    }

  }
}
</script>
<style scoped lang="scss">
    .upload-excel {
      display: flex;
      justify-content: center;
      margin: 20px;
      width: 360px;
      height: 180px;
      align-items: center;
      color: #697086;
      .excel-upload-input {
        display: none;
        z-index: -9999;
      }
      .btn-upload,
      .drop {
        border: 1px dashed #dcdfe6;
        width: 100%;
        height: 100%;
        text-align: center;
        line-height: 160px;
        border-radius: 8px;
        display: flex;
        flex-direction: column;
        justify-content: center;
      }
      .drop {
        line-height: 40px;
        color: #bbb;
        i {
          font-size: 60px;
          display: block;
          color: #c0c4cc;
        }
      }
    }
</style>
